Process of maintaining high pressure in superheaters



2 Sheets-$heet 1.

(No Model.)

B. RENSHAW.

PROCESS OF MAINTAINING HIGH PRESSURE IN SUPERHEATERS.

Patented Aug. 7, 1883.

WITNESSES D. RENSHAW'.

PROCESS OF MAINTAINING HIGH PRESSURE IN SUPERHEATERS.

Patnted Aug. 7, 1883. 4

UNITED STATES I'PATENT OFFICE.

DAVID RENSHAW, .OF BRAINTREE, MASSACHUSETTS.

PROCESS OF MAINTAINING HIGH PRESSURE IN SUPERHEATERS.

SPECIFICATION forming part of Letters Patent No. 282,772, dated August '7, 1883.

7 Application filed January 6, 1883. (No model.)

To all whom it may concern.-

Be it known that 1, DAVID RENSHAW, of Braintree, in the county of Norfolk and State of Massachusetts, have invented certain new and which form part of this specification.

This invention has for its object to maintain a higher degree of pressure in a superheater than is maintained in or at its source of supply and it consists in the process of introduc ing steam, or steam and water combined, atmospheric air, or other expansible gas, into a superheating-vessel of suitable construction for producing and maintaining therein a pressure greater than that of the source of supply.

For a better and clearer understanding of my invention reference is made to theaccompanying drawings, which illustrate one means of carrying out my invention, and which in part illustrates the subject-matter of a separate application.

Figure 1, Sheet 1, shows a' side elevation, partly in section, of my apparatus; Fig. 2, Sheet 2, a modification of thesame designed for air and gases.

The same letters denote like parts in all the figures.

A is the casing or brick setting.

B B B are sections of a superheater, which are joined and communicate with each other. There maybe as many of these sections as may be required. The contours of these sections are segments of circles, or maybe fully semicylindrical, each end of which is connected to a horizontal pipe, 0, and all of which are located within the setting A.

At the rear end of the furnace, connecting with a rear section of the superheater and ex; tending through the wall of the setting, I 10- cate an injector, D, of any ordinary construc tion; and communicating with this injector is a pipe, E, leading to the steam-boiler pipe F. Upon. the end of pipe E, I place a return bend or elbow, a, for the purpose of receiving an injection-nozzle, b, to which'is attached a pipe,

'G, leading to and forming a junction with the power-eseapepipe H, as shown by letter I. The pipes G and II also join a pipe, J, at junction I, through which steam from the superheater passes to and through the pipes H and G. The junction-pipes G, H, and E are provided with controlling-valves c d, which simultaneously open and close them, the purposes of which will be hereinafter described.

Upon the outside of the brick setting I locate a small water-tank, K, which communicates with pipes L and E for the supply of a small quantity of water before steam is admitted to the superheater.

Should it be preferred, a small pump, 0, may be used, it being supplied with steam by a branch pipe, N, from the steam-pipe F.

L WVith reference to the modification shown on Sheet 2, like parts are used as those shown on Sheet 1, and embodying the same principles, only in the former case atmospheric air or gases that are capable of expansion may be operated with, and the injectors shown are somewhat different.

The operation is as follows: Steam being up in the boiler and fire being made in the furnace of the superheater,-a small quantity of water is admitted from the tank K to thelower portion of pipe L, where steam from the boiler is also admitted and the valve f again closed. The steam and water just mentioned expand within the superheater, thus creating the required pressure for working operations. Valve e is now closed and valve f opened, and also valves 0 and cl simultaneously, which permits steam from the superheater to take two three ,tions from the same section-the front and hottest onethe steam from valve (1 to the engine, and from the same valve through G to the injector, where it meets boiler-steam, passing through valve 0 and pipe E, also to the injector, where the superheated-steam jet, coming in contact with the boiler-steam of less temperature, gains in momentum without loss of velocity, and thence passes into the superheater, establishing a current and maintaining the pressure. used for supplying air or gas, if desirable, or they may be introduced at the injector or rear end of the superheater, as shown by pipe P. (See Sheet 2.)

I claim as my invention and desire to secure 3., The combination, in an apparatus for 20 by Letters Patent 1. The process of maintaining pressure within a superheater greater than that of the source of supply by creating a current of the superheated steam or gases through a superheater, said current being created by withdrawing steam or gas from one end of the superheatingvessel, and injecting a portion of it at the other with steam or gas of greater density, as described.

2. The process of maintaining pressure maintaining pressure in a superheating-vessel greater than that of the source of supply, consisting of the superheater, the boiler-steam pipe, and the superheated-steam pipe, and the injector, substantially as described.

4. The combination, in an apparatus for maintaining pressure greater than that of the source of supply, consisting of the superheater, the boiler-steam pipe, the superheated-steam pipe, and the injector, with the intermediate operating-valves, as described.

In testimony that I claim the foregoing as my own invention I afiix my signature in pres ence of two witnesses.

DAVID RENSHAW.

\Vitnesses:

B. F. MORSELL, EUGENE D. CARUSI. 

